Two-dimensional direct numerical simulations and the linear stability analysis are performed for a flat-plate boundary layer in the Mach 6 free stream with the presence of local volume energy supply. It is expected that this technique can be used for the laminar flow control at high speeds. It is shown that the heat source produces different effects depending on its streamwise distance from the plate leading edge. If the source is located upstream from the neutral point, it reduces the second-mode growth rates and thereby diminishes the maximum amplitude of instability. If the source is shifted downstream from the neutral point, the stabilization effect becomes weaker while the scattering of unstable waves by the source-induced non-uniformity of the mean flow comes into play.
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